EDIT MAIN
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Why do i get the 'This root  Certificate is not trusted' error?

You would face the root certificate not trusted error is the Securly SSL certificate is not installed on your macOS X.

To stop receiving the error you would, therefore, need to install the SSL certificate.

  1. Download the Securly certificate CRT file. (securly_ca_2034.crt)
  2. Navigate to Finder > Applications > Utilities > Keychain Access
  3. Select ‘System’ in the left-hand column.
  4. Open ‘File > Import Items’ and import the certificate file into the ‘System’ keychain.
  5. Alternatively, you can automate the installation process via MDM by downloading the executable file at the end of this article.

macosxsslcertinstall__1_.gif

You also have to perform the following. Double click on the Securly Certificate to open the following screen, then click on the Trust dropdown. 

Change "Use System Defaults" to "Always Trust". Close the box and you will be asked for your Keychain password.